cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A257669 Number of terms in the sigma(x) -> x subtree whose root is n.

Table of values

n a(n)
1 1
2 1
3 2
4 3
5 1
6 2
7 4
8 5
9 1
10 1
11 1
12 4
13 2
14 3
15 6
16 1
17 1
18 3
19 1
20 2
21 1
22 1
23 1
24 11
25 1
26 1
27 1
28 5
29 1
30 2
31 3
32 5
33 1
34 1
35 1
36 2
37 1
38 2
39 4
40 2
41 1
42 5
43 1
44 2
45 1
46 1
47 1
48 4
49 1
50 1
51 1
52 1
53 1
54 3
55 1
56 10
57 2
58 1
59 1
60 15
61 1
62 2
63 6
64 1
65 1
66 1
67 1
68 2
69 1
70 1
71 1
72 7
73 1
74 2
75 1
76 1
77 1
78 2
79 1
80 4
81 1
82 1
83 1
84 5
85 1
86 1

List of values

[1, 1, 2, 3, 1, 2, 4, 5, 1, 1, 1, 4, 2, 3, 6, 1, 1, 3, 1, 2, 1, 1, 1, 11, 1, 1, 1, 5, 1, 2, 3, 5, 1, 1, 1, 2, 1, 2, 4, 2, 1, 5, 1, 2, 1, 1, 1, 4, 1, 1, 1, 1, 1, 3, 1, 10, 2, 1, 1, 15, 1, 2, 6, 1, 1, 1, 1, 2, 1, 1, 1, 7, 1, 2, 1, 1, 1, 2, 1, 4, 1, 1, 1, 5, 1, 1]